Most workers in nanotechnology are actively monitored for excess static charge b

Question

Most workers in nanotechnology are actively monitored for excess static charge buildup. The human body acts like an insulator as one walks across a carpet, collecting -50 nC per step. What charge buildup will a worker in a manufacturing plant accumulate if she walks 15 steps? How many electrons are present in that amount of charge? If a delicate manufacturing process can be damaged by an electrical discharge greater than 10^2 electrons, what is the maximum number of steps that any worker should be allowed to take before touching the components?

Explanation / Answer

a) Charge build up in 15 steps = 15 * -50 * 10-9

= -750 nC

b) Number of electrons in that amount of charge

= (750 * 10-9 C) / (1.60 * 10-19)

= 4.69 * 1012 electrons

c) Maximum number of steps N = (1012 * 1.6 * 10-19) / 50 * 10-9

= 3 steps

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